myford mg12 cylindrical grinder

Discussion in 'Machine Modifications' started by blighty, Sep 26, 2013.

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  1. Dec 15, 2016 #21

    blighty

    blighty

    blighty

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    dont you just love ebay!

    when i got this thing, it didn't come with a tail stock. the guy had a look, but couldn't find it. never mind i'll see if a can get one. HOW RUDDY MUCH! this was the only one i found..... all yours for £1950 here is the link http://www.jubileemactools.com/website-pages/MYFORD_MG12_Tailstock._NEW!-p-446.html

    two weeks ago i thought i would have another look, one on ebay came up £70 all in :thumbup::thumbup::thumbup:

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  2. Dec 17, 2016 #22

    blighty

    blighty

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    Jim,

    as it took me 3 years to get the top on, i'm not taking it off again. so this is the best i can do :)

    you can get to the bolt by the door on the front.

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  3. Dec 17, 2016 #23

    blighty

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    the spring guides??? under the table.

    2.jpg

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  4. Dec 17, 2016 #24

    blighty

    blighty

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    the feet with the wheels on,

    the bit on the bottom is made from 1 1/2 angle (i think, i should measure it:wall:)
    that tucks under the base, the wheel have been made to stick out 6mm below this. when you screw the levelling screws down you can push them under the base. then get the ratchet strap and tighten them together. then wind the levelling screws back up.

    be careful when pushing it around, the mg-12 is VERY top heavy. wouldn't take much for it to go over.

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  5. Dec 31, 2016 #25

    blighty

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    been playing in the shed again :D

    the beds of OD grinder come in two parts. there is the main part that is fixed and goes up and down the main bed. the other table (the one you can see) sits on top of the fixed one, but can pivot in the middle. when i was cleaning this part up it seemed a bit stiff. thought best do it proper like and take it to bits. the pic shows it was full of this rubber grindings/dust stuff.

    the work head was no better. second pic... top right is where the work head is.

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  6. Dec 31, 2016 #26

    blighty

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    separating the work head bits, found more rubber gunk.

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  7. Dec 31, 2016 #27

    blighty

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    random pics of the rest.

    work head drive housing.
    coolant tank.
    guides that sit between the bed and table.

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  8. Dec 31, 2016 #28

    blighty

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    all done.... ish. need to sort out the main coolant tank and pump. and give the bottom half a lick of paint.

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  9. Dec 31, 2016 #29

    bazmak

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    I did not realize Myford made industrial machines.Nice refurb job well done
    I wonder how much profit you could make on that,if you can get out of the shed
     
  10. Mar 25, 2017 #30

    MachineTom

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    All depends what a willing buyer will pay a willing seller. lOL
    The market for cylindrical​ grinder s is very small. While CNC cylindrical grinders are still in use, manual machines are no longer made.
     
  11. Nov 6, 2018 #31

    RGerlach

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    Not sure how to start a new thread so I will post a reply with my new message.
    I picked up an MG12 machine that was a little rough around the edges. I have gone far enough to make everything functional and have actually done some OD grinding. The BIG problem is the leaking wheel spindle seals. The pulley side leaks so badly that I can hardly get more than a few minutes of grinding done before new oil leaks out and onto the pulley making the belt slip and slide badly. How big of a job is it to change both seals? I have sent an email off to Jubilee Machine Tools to inquire about the availability of the replacement seals and am waiting for a response.
    I have included a photo of the "as received" condition. It looks much better now but I don't have any good pictures.
     

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  12. Nov 6, 2018 #32

    blighty

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    if your head is the same as my one, there are two bolts on the other side of the spindle (from the front) that you undo. The housing for the spindle is split, undoing these bolts lets the whole spindle come out the wheel side.

    i'll post some pics later to night. might explain things better.
     
  13. Nov 6, 2018 #33

    BaronJ

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    Hi Guys,

    A couple of years ago, I looked at one in a Birmingham dealers yard. It had been stood out in the weather for at least six months, everything that could go rusty was. It was waiting to be put into a container and shipped to India. The dealer said I could have it for £150.00p if I provided the transport to take it away. Sadly at the time I couldn't find a company who was prepared to shift it for me. It had been shipped off a few weeks later.

    I did find out that there was a group of buyers going round factories and auctions buying machines of all kinds and shipping them to India.
     
  14. Nov 11, 2018 #34

    blighty

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    sorry for the delay........

    I haven't taken the main spindle out, but it moved after i rebuilt the whole machine. then noticed i hadn't put the screws back in.
    It looks like the spindle is in a sleeve that you take out in one piece as unit. Slides out the wheel end. Inked1_LI.jpg
     
  15. Nov 24, 2018 #35

    RGerlach

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    Thanks for the pic but it looks different than mine.
    I did finally figure out how to get mine all apart with some help from Andrew at Jubilee Machine Tool. I have all the old seals out and waiting for the new seals to show up next week. I did not have to remove the wheel spindle cartridge. I was able to do everything with it in place. The only tricky part is that I need to modify the bronze conical sleeve bearing so I can press the wheel side seal a bit further into the spindle towards the pulley side. There is a common problem where abrasive grit gets onto the wheel side seal lip and wears a nice groove into the spindle surface. Andrew's suggestion was to slightly deepen the bore where the seal goes. The added depth just has to be enough to move the lip past the little groove so it is resting on virgin metal.
     
  16. Nov 25, 2018 #36

    Cogsy

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    Alternatively you could fit a speedi-sleeve. They are simple to install and don't require a different sized seal to be fitted. Done properly, it's as good, or better, than the original shaft.
     
  17. Nov 25, 2018 #37

    MachineTom

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    I had a similar problem with the workhead. The seal Myford used was unique size on the ID. No standard seal could fit it, so I made a sleeve to fit the std size oil seal., installed that on the spindle, worked fine.
     
  18. Nov 26, 2018 #38

    blighty

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    as we have a few people with MG12's. do any of you guy's have some form of filter on you coolant?

    when i got mine, there was a big tank bolted to the side of the base. the coolant would over flow through two pipes into this tank where it would then be pumped back up the the wheel. Looking all over this there seems to be no filter. my only thought is that the grindings would sink to the bottom of the top tank and the clean ish coolant would go out through the pipes into the main tank. if this is the idea, doesn't seem to be a good one. As i got rid of the main tank i'm just circulating all the crap around. need to sort out a filter.

    was thinking of big bucket with the pump in it that will sit behind the grinder. the over flow pipes would drain out into another bucket (that fed the main bucket) with some sort of filter in it. but what could i use as a filter? would think it would need changing quite often.
     
  19. Nov 26, 2018 #39

    blighty

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    this is the part im using as the coolant tank. the pump just at the bottom.
    [​IMG]
     
  20. Nov 27, 2018 #40

    DJP

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    While working at an SKF manufacturing plant in my youth, we shut down the plant for a week each summer to clean out the 'mud' that created sediment in the coolant rivers that flowed under the machines. I don't remember any filter in the system so a little grinding waste in the coolant water must be OK. It did stink after a year which is why students were hired.

    A fine mesh screen as a filter should work and you may need to back flush it often. A plan for annual cleaning of the holding tank would be prudent.

    I have avoided grinding machines and coolant in my shop for some reason and now it makes sense.
     

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